| URL | Priority | Change frequency | Last modified (GMT) |
|---|---|---|---|
| https://22nd-century.jp/environment-issues/water-pollution/ | 20% | Monthly | 2021-09-10 23:35 |
| https://22nd-century.jp/environment-issues/soilpollution/ | 20% | Monthly | 2022-01-17 11:10 |
| https://22nd-century.jp/environment-issues/acid-rain/ | 20% | Monthly | 2021-10-28 05:32 |
| https://22nd-century.jp/environment-issues/hydrogen-energy/ | 20% | Monthly | 2021-09-23 03:39 |